ABOARD THE PAPAL AIRPLANE (CNN) -- In a wide-ranging news conference with journalists while traveling back to Italy, Pope Francis addressed nearly every hot-button issue facing the Roman Catholic Church -- its alleged "gay lobby," Vatican bank corruption, the role of women, abortion, homosexuality and his own personal security.

The pontiff spoke on the record for an hour and a half in the back of the plane that was carrying him back to Italy after his first international trip as pope to Brazil, where he was greeted by massive, frenzied crowds at every turn.

"I'm happy. It has been a beautiful trip, spiritually speaking; it has been good to me. I'm tired enough but with a heart full of joy. I'm well; this trip has done me good. To be amongst the crowd is good for you," he said.

On Sunday, the mayor's office in Rio de Janeiro said more than 3 million people came to Copacabana Beach for a morning Mass with Francis, who was in Brazil for the weeklong World Youth Day celebration.

Security issues plagued the trip because of Francis' immense popularity as the first Latin America pope. His arriving motorcade was mobbed after a wrong turn, prompting the Brazilian military to raise the trip's security level to "high risk" and send in reinforcements to protect the pontiff, who insisted on being close to the people.

"We've had problems on the hypothesis of security: security here, security there. There was no incident in all of Rio de Janeiro in these days, and everything was spontaneous. With less security, I was able to be with the people, hug them, greet them without bulletproof cars," he said.

"There is always the danger that there is the crazy person, and we never know what he or she will do. But to create a safety barrier between the bishop and its people is insane. And I'm outside this security. I prefer the risks of the madness outside, to be close to the people."

On the 'gay lobby' and homosexuality

The pope addressed the issue of an alleged "gay lobby" within the church. Hints that the Holy See contained a network of gay clergy surfaced last year in reports about a series of embarrassing leaks to Italian journalists.

The "Vatileaks" scandal factored in Pope Emeritus Benedict XIV's shocking decision to resign this year, according to some church experts, as it impressed upon the 86-year-old pontiff that the modern papacy requires a vigorous and watchful presence.

"There's a lot of talk about the gay lobby, but I've never seen it on the Vatican ID card!" Francis said.

"When I meet a gay person, I have to distinguish between their being gay and being part of a lobby. If they accept the Lord and have goodwill, who am I to judge them? They shouldn't be marginalized. The tendency (to homosexuality) is not the problem ... they're our brothers."

The problem, he said was, lobbies that work against the interest of the church.

On women

The pope also spoke out about the role of women in the church, saying it needs to be deeper and not end. But he brushed aside the possibility of ordaining women as priests, saying the church had spoken on the matter: "The church says no. That door is closed." He did say that more work needed to be done theologically on the role of women in the church.

On abortion

Pope watchers have noted that Francis said little to nothing about abortion on his trip to Brazil. Abortion is illegal in Brazil, except for cases in which the health of the mother is at risk. Laws were recently changed to allow abortions in cases in which the child would be born with certain life-threatening birth defects.

The pope said he had nothing to say on the trip about abortion because the church teachings against it were clear and this trip was the time for "positive" news.

On divorce

"I believe this is a time of mercy, a change of epoch," the pope said when asked about divorce. He said the group of eight cardinals tasked with reform will explore the issue of whether divorcees can receive Communion, which they are currently barred from doing.

On the Vatican Bank

The pope conceded he was unsure what to do with the Vatican Bank, which is known by its acronym IOR.

"Some say that it would be better if it were a bank, others say that it should be a foundation. Other say to shut it down. These are the suggestions going around. I don't know. I trust the commission's members that are working on the IOR. But I wouldn't be able to tell you how this story is going to end."

And as for what was in the black leather bag he carried onto the plane? A razor, a prayer book, a diary and a book about St. Theresa, but, the pope joked, "Certainly not the keys to the atomic bomb!"

He said he carried his own bags because "It's normal, we have to be normal. We have to be accustomed to being normal."